Exploration of magnetic field generation of H$_3^{2+}$ by direct ionization and coherent resonant excitation

2021 ◽  
Author(s):  
Zhi-Jie Yang ◽  
Qing-Yun Xu ◽  
Yong-Lin He ◽  
Xue-Shen Liu ◽  
Jing Guo
2021 ◽  
Vol 9 ◽  
Author(s):  
André D. Bandrauk ◽  
Szczepan Chelkowski ◽  
Kai-Jun Yuan

We theoretically study pulse phase and helicity effects on ultrafast magnetic field generation in intense bichromatic circularly polarized laser fields. Simulations are performed on the aligned molecular ion H2+ from numerical solutions of corresponding time-dependent Schrödinger equations. We demonstrate how electron coherent resonant excitation influences the phase and helicity of the optically induced magnetic field generation. The dependence of the generated magnetic field on the pulse phase arises from the interference effect between multiple excitation and ionization pathways, and is shown to be sensitive to molecular alignment and laser polarization. Molecular resonant excitation induces coherent ring electron currents, giving enhancement or suppression of the phase dependence. Pulse helicity effects control laser-induced electron dynamics in bichromatic circular polarization excitation. These phenomena are demonstrated by a molecular attosecond photoionization model and coherent electron current theory. The results offer a guiding principle for generating ultrafast magnetic fields and for studying coherent electron dynamics in complex molecular systems.


2010 ◽  
Vol 38 (8) ◽  
pp. 1719-1722 ◽  
Author(s):  
Victor D Selemir ◽  
Vasily A Demidov ◽  
Pavel B Repin ◽  
Andrey P Orlov ◽  
Nikolay V Egorov

Author(s):  
А.Н. Годомская ◽  
О.В. Шереметьева

В динамической модели -динамо с переменной интенсивностью -генератора моделируются инверсии магнитного поля. Изменение интенсивности -генератора как следствие синхронизации высших мод поля скоростей и магнитного поля регулируется функцией Z(t) со степенным ядром. Получены режимы динамо для двух видов радиальной составляющей в скалярной параметризации -эффекта. Проведён анализ результатов в зависимости от изменения показателя степени ядра функции Z(t), а также сравнительный анализ с результатами исследования 10, где использовано показательное ядро функциии Z(t). In the dynamic model -dimensions are simulated reversions of the magnetic field with a varying intensity of the -generator. The change of the -generator intensity as a result of synchronization of higher modes of the velocity field and the magnetic field is regulated by a function Z(t) with a power kernel. Dynamo modes are obtained for two types of radial component in the scalar parameterization of the -effect. The results were analyzed depending on the change in the exponent of the kernel of the function Z(t), also a comparative analysis with the results of the study 10, where the exponential kernel of the function Z(t) was used.


2021 ◽  
Vol 92 (12) ◽  
pp. 123506
Author(s):  
A. G. Luchinin ◽  
V. A. Malyshev ◽  
E. A. Kopelovich ◽  
K. F. Burdonov ◽  
M. E. Gushchin ◽  
...  

2001 ◽  
Vol 66 (3) ◽  
pp. 213-222 ◽  
Author(s):  
GUIDO T. BIRK ◽  
A. KOPP ◽  
H. LESCH

The self-magnetisation of circumstellar disks is considered within an appropriate multifluid description. These disks are composed of ionised and neutral gas as well as of a charged dust component. The most important equation in this context is the general Ohm’s law that includes a magnetic field generation term due to relative dust–neutral fluid velocities. We show that circumstellar disks can carry their own significant magnetic fields. As long as the stellar gravitation sustains the accretion flow, the self-magnetisation of the disk does not saturate until the field strength reaches its local equipartition value. The magnetic field generation process is illustrated by idealised multifluid simulations that are not restricted to a kinematic description, but model the process in a self-consistent way.


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